I know how you feel because if it were my own personal quilt I would be ripping that baby out before you could say boo, but I would not fix this block for fear of really hurting her feelings. I would take some starch and press the thing into submission. With 40 blocks I don't think it will really show unless you are looking for it. If she is to make another block I would have someone sit with her and help her with each step.